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The Indian Ocean Dipole is the measure of changes in sea surface temperature patterns
in the northern Indian Ocean.
It is derived from the difference in sea temperature between the western Indian Ocean
near Africa, and the eastern Indian Ocean near northern Australia.
A positive Indian Ocean Dipole is seen when
waters are warmer than normal near Africa, and
cooler than normal near Australia. This is
usually observed during El Niño events, and
usually results in less rainfall over South
The opposite is broadly true—a negative
Indian Ocean Dipole is associated with warmer
waters off north-west Australia, and usually
results in increased rainfall over South
These patterns vary over periods of weeks to
months. The dipole can be considered as the
tropical Indian Ocean equivalent of the El Niño -
Southern Oscillation effect in the Pacific Ocean.
The Indian Ocean Dipole effect was proposed in
the late 1990s, and is the subject of further research. As modelling of the ocean and
atmosphere improves, the ability to forecast these patterns of sea surface temperature is
also improving, so that forecasts several seasons ahead may be useful in the near future.
Originally posted by YoungStalin
My friend Dr. Rufus Red lived in Whales for a while,......
Originally posted by Evasius
This will be probably the hottest temperature I've ever experienced while living here in Australia. 47C is the equivalent of 116.6F. For the last few weeks temps of 30 and above have been standard here in NSW, with quite a few consecutive days in Victoria reaching above 40C.
Growing up in Kentucky, I grew accustomed to hot, humid summers. I remember the temperature getting up to around 105-108 before. There we had a thing called the 'heat index' that gave an estimate as to what it felt like given the amount of humidity in the air. 116F actual temp is way the heck above that for sure.
Both my hometown in KY, as well as where I currently live in Sydney have been hit by a number of extremes over the past 12 months. Western KY has so far had to declare emergencies 3 times over the past year (tornado, remnants of Ike, and now the latest ice storm). In my 23 years growing up there, not one emergency was declared. In the recent ice storm, my parents were without power for over a week...the situation was dire to say the least. The ice buildup on every tree was between 1-2 inches. The devastation across the area is immense.
Are these events just flukes, or are they yet more proof that the weather is continuing to fluctuate further into extremes? Is this a cycle, man-made, or both?
(visit the link for the full news article)
[edit on 5/2/09 by Evasius]